Question

I’m working with redis and ruby and attempting to issue a blpop within a thread, so that I can wait for an incoming item on a list.

The problem is that the code within the block for blpop never seems to get called. Here’s the sample code that I’m running (ruby 1.9.3):

require 'rubygems'
require 'redis'

def start_thread
  @thread = Thread.new do
    r = Redis.new
    r.blpop("test", 0) do |key, message|
      process_message(key, message)
    end
  end
  redis = Redis.new
  redis.rpush "test", "hello world"
end

def process_message(key, message)
  @message = "#{key} was sent #{message}"
end

start_thread
@thread.join
p @message

Any help is greatly appreciated!

Answer 1

require 'rubygems'
require 'redis'

def start_thread
  @thread = Thread.new do
    r = Redis.new
    key, message = r.blpop(:test, 0)
    process_message(key, message)
  end
  redis = Redis.new
  redis.rpush :test, "hello world"
end

def process_message(key, message)
  @message = "#{key} was sent #{message}"
end

start_thread
@thread.join
p @message